Release clutch for grinding mills



March 30,1926. 1,579,057

H. E. ASBURY RELEASE CLUTCH FOR GRINDING MILLS Filed Jill 1, 1924 2Sheets-Sheet1 [wmfl Harryfl Hagar :7. 5 68 4??? March 30,1926. 1,579,057I H. E. ASBURY RELEASE CLUTCH FOR GRINDING MILLS Filed July 1, 1924 2Sheets-Sheet 2 latented Mar. 30, 1926. g

,UNITED vs' 'mfriz s PATIENT cariesrunny: E. ASBURY, or MELROISIE PARK,PENNSYLVANIA, ASSIGNOR TO THE ENTER- muss MANUFACTURING COMPANYonrnNNsYLv NIA,; or PHILADELPHIA, PENN- SYLVANIA, A CORPORATION or.PENNSYLVANIA.

RELEASE CLUTCH FOR GRINDING MILLS.

7 Application filed July 1,

to the movable disk from the shaft, the

clutch being so constructed that it will yield when foreign matterpasses between thetwo disks, or when the mill is choked.

This yielding prevents breaking :of the parts.

In the accompanying drawings:

' Fig. 1 is a longitudinal sectional view of a portion of a grindingmill illustrating my invention;

Fig. 2 is a sectional view on the line 2-2, Fig. 1; I

Fig. 3 is a sectional view on the line 3-3, Fig. 1; and

Fig. 4 is a detached perspective view showing portions of the clutch.

Referring to the drawings, 1 is the body of the mill. 2 is a portion ofan electric motor, having a shaft 3, which drives the shaft 4 of. themill. The coupling is made as shown clearly in Fig. 1. Enclosing thecoupling is a sleeve 5. Between the head 6 of the sleeve and the end ofa feed screw '7 is a coiled spring 8. This spring tends to force the twodisks of the mill apart. The hopper 9 ofthe mill is directly above thefeed screw 7. Thedischarge opening 10 for the ground material is locatedunder the disks. The grinding disk 11 is secured to the body of the milland has grinding teeth of any shape desired. The mill is fed by thescrew 7 through the throat 12 of the disk. The rotating grinding disk 13is mounted on an extension 14' of the feed screw 7 Back of the grinding.disk 13 is a disk 15. The two disks are secured to the screw 7 by one,or morescrews 7 4, beyond the screw 7, is a collar 16, which is securedto the shaft by a pin 17 This choked.

I cover plate against a earn a sleeve 32 by means of screws 33, Flg. 1.'

On the shaft 1924. Serial No. 723,568.

collar has a transverse groove 18 therein, as shown clearly in Fig. 4,and forms one member of the clutch. The other member of the clutchconsists of a ball 19, which is mounted in a radial channel 20 in aprojection 21 that is cast integral with the disk 15. The projection '21is tubular, as shown.

Mounted in the projection is a sliding plunger 22, back of which is acoiled spring 23, which is held in place by a screw 24.

The end of the plunger is beveled, as shown at the center to receive theball 19, when it is forced out of the groove 18 in the collar 16. Thisconstruction forms a release clutch betweenlthe power driven shaft andthe grinding disk so as to prevent the clearly in Fig. 4,"and has aconical seat 25' 1 breaking of the parts when the mill becomes Mountedon 26. In this cover plate is a bearing 27, which is heldin'place by aset screw 28. Beyond the bearing and within the body portion 1 is the anextension 29 of the cover plate 26'is a cam disk 30, which has three camfaces, in 1 the present-instance. These cam faces rest block 31 that issecured to This sleeve is mounted on the extension 29 of the cover plate26 and is so shaped that it can be grasped by the hand to turn it on theextension to adjust the cam block 31 in respect to the cam disk 30.Located in the camdisk '30 is a ball thrust bearing 34, which receivesthe thrust of the shaft 4. On the cam disk 30 is a projection 35, whichenters a recess in. the bearing 27 which. prevents the turning of thecam disk.

In order to tion in which it is adjusted, a plunger 36 is provided,which is mounted inthe sleeve. Back of the plunger is a spring 37. Thisplunger is adapted to enter any one of the depressions 38 in the? end ofthe cover plate 26, thereby retaining the sleeve in the position inwhich it is adjusted. In order to limit the movement of the sleeve, apin 39,

' carried by the sleeve, extends into a slot 40 hold the sleeve 32 inthe posiin the end. of the extension 29 of the cover plate 26; Thesleeve may have marks indieatingv whether it is adjusted to grindcoarse, medium or fine.

clear the material from the interior of the grinding chamber. Oppositethe projection 21 is a projection 49., which acts as a bearing with theprojection 21, to holdthe disk in alignment with the cover plate 26.

By the construction hereinbefore described, it will be seen that if thematerial should clog the grinding mill, or, it any foreign matter passesbetween the plates, the ball of the release clutch is forced out ot thegroove '18 and into the radial channel in the projection 21,- being heldin the channel by the plunger 22, as shown by dotted lines in Fig. 2.v

It will be noticed that the walls of the groove 18 are beveled. Thebevel may be of any degree desired to allow the ball to be held inposition until vibrced out should the parts become clogged. Underordinary grinding, the rotating grinding disk 13 is driven from theshaft 4. through-the release clutch.

I claim: V

1. The combination in a release clutch,

of a shaft; a collar on the shaft, said collar having a groove therein;a member on the shaft and having a tubular pro ection; a

radial channel in the projection; a sliding plunger in the tubularprojection; a spring back of the plunger; and a ball in the radialchannel arranged to enter the groove in the collar, the plungeryieldingly holding the ball in engagement with the collar.

2. The combination in a release clutch, of i tending to hold the ball inthe groove of the collar, said plunger having a conical seat in its endfor the ball when moved outo'f engagement with the sleeve; and a springback of the plunger.

HA RY A BURY-

